This means that in the case of Ryujinx, there are games that could be launched while some others are still unplayable. The codebase is mastered is C# and is still considered an experimental software. Now, gdkchan leads some developers with the intent of launching a stable version.
Ryujinx is made as a Nintendo Switch Emulator that was started by a developer under the codename of gdkchan. Ryujinx is a free and open-source emulator of the Nintendo Switch.